Across
- 1. Our sister planet
- 3. Four outer gas planets
- 5. This planet is tipped on its side
- 6. The Sun is composed mainly of this element
- 10. Icy leftovers from the formation of the solar system
- 11. Home
- 12. In this type of mission, something is brought back
- 13. Mercury looks a lot like our ___________
- 14. First planet from the Sun
- 15. Pluto is now a ____________
- 16. This object has five moons
- 17. This planet has the most spectacular rings
- 19. This planet is home to the Galilean Moons
Down
- 2. Home planet to the moon Triton, a moon that orbits backwards
- 4. Venus has a very thick ____________________
- 7. The red planet
- 8. Rocky leftovers from the formation of the solar system
- 9. Four inner rocky planets
- 10. Type of planetology that compares planets
- 18. Most massive object in our solar system